package com.lbc.future;

import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;

/**
 *   异步调用：CompletableFuture
 *   //  异步执行
 *   //  成功回调
 *   //  失败回调
 */
public class Demo01 {
    public static void main(String[] args) throws ExecutionException, InterruptedException {
        //  发起一个请求
        //  没有返回值的 runAsync 异步回调
        CompletableFuture<Void> completableFuture = CompletableFuture.runAsync(()->{
            try {
                TimeUnit.SECONDS.sleep(2);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println(Thread.currentThread().getName()+" runAsync=>Void");
        });

        System.out.println("111");
        completableFuture.get();  // 获取阻塞执行结果

        //  有返回值的异步回调  supplyAsync
        //  类比 ajax ,有成功和失败的回调
        CompletableFuture<Integer> completableFuture2 = CompletableFuture.supplyAsync(() -> {
            System.out.println(Thread.currentThread().getName()+" supplyAsync=>Integer");
            int i = 1/0;
            return 1024;
        });
        Integer integer = completableFuture2.whenComplete((t, u) -> {
            System.out.println("t=>" + t);  //  正常的返回结果
            System.out.println("u=>" + u);  //  错误信息：ava.lang.ArithmeticException: / by zero
        }).exceptionally((e) -> {
            System.out.println(e.getMessage());
            return 233;  //  错误的返回结果
        }).get();
        System.out.println(integer);


    }
}
